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The term "indefeasible" in a legal context means something that cannot be annulled, voided, or undone. In the United States, an indefeasible share is a legal protection for a surviving spouse, guaranteeing them a specific portion of the deceased's estate. This portion is typically a fixed dollar amount or a fraction of the estate. However, this protection can be diminished if the deceased gave away most of their property before death. Some states have laws allowing the spouse's rights to be asserted against such pre-death transfers to address this weakness.12

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